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Events After the Reporting Date (Details) - EUR (€)
€ in Thousands
12 Months Ended
Feb. 15, 2021
Feb. 11, 2021
Jan. 28, 2021
Jan. 25, 2021
Aug. 17, 2018
Dec. 31, 2020
Feb. 10, 2021
Jan. 06, 2021
Events after the reporting date                
Bank guarantee and pledge of gradual rate deposit account           € 1,700    
Impairment of tax loss carry back           € (333)    
Inventiva Inc.                
Events after the reporting date                
Proportion of ownership interest in subsidiary           100.00%    
Provision for CIR risk related to tax audit for the years ended December 31, 2013, 2014 and 2015                
Events after the reporting date                
Proposed tax adjustment         € 1,900      
Provision for CIR risk related to tax audit for the years ended December 31, 2013, 2014 and 2015 | Minimum                
Events after the reporting date                
Initial provision           € 400    
Provision for CIR risk related to tax audit for the years ended December 31, 2013, 2014 and 2015 | Maximum                
Events after the reporting date                
Initial provision           1,500    
Guarantee given to the tax authorities | Provision for tax audit for the years ended December 31, 2016 and December 31, 2017                
Events after the reporting date                
Bank guarantee and pledge of gradual rate deposit account               € 1,000
Tax audit for payroll taxes | Provision related to tax audit for the years ended 2013, 2014 and 2015                
Events after the reporting date                
Period to conduct the appeal process       2 months        
Settlement of maximum indemnification requested             € 2,000  
Proposed tax adjustment   € 1,900            
Impairment of tax loss carry back                
Events after the reporting date                
Impairment of tax loss carry back € 300              
Tax audit for CIR | Provision for CIR risk related to tax audit for the years ended December 31, 2013, 2014 and 2015                
Events after the reporting date                
Amount of relief from tax assessment     € 300          
Tax audit for CIR | Provision for CIR risk related to tax audit for the years ended December 31, 2013, 2014 and 2015 | Minimum                
Events after the reporting date                
Initial provision           400    
Tax audit for CIR | Provision for CIR risk related to tax audit for the years ended December 31, 2013, 2014 and 2015 | Maximum                
Events after the reporting date                
Initial provision           € 1,500